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Fossil collection records
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Classification of the genus
Isonema
G. †
Isonema
Meek and Worthen 1866
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Isonema depressum
Meek and Worthen 1866
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Invalid names:
Isonema humile
Meek 1871 [synonym]
†
Isonema linearis
Keyes 1889
†
Isonema verae
Frech 1894